Abstract: :
Purpose: To prospectively measure the scotopic pupil diameterin a normal population in young Chinese subjectsMethods: 186 eyes of 93 normal subjects (mean age 31years±7.9[SD]) were evaluated for pupil sizes under scotopic condition(0.02Luxes) using computerized infrared pupilometer (Made byBeijing And–sight Corporation). All subjects were examinedby the same researcher following the dark adaptation of twominutes, and 40 examinees were examined again after one weekby the same researcher.Results: Under scotopic condition, the mean pupil diameter ofthe right eyes was 7.04±0.93mm(range: 4.85–8.89mm)whilethat of the left eyes was 7.11±0.86mm(range: 4.99–9.13mm),which showed statistical difference between bilateral pupils.Our data revealed no significant sex difference of size of pupil.For 40 subjects undergoing repeated examinations, the averagepupil sizes of the right and left eyes were 6.93±1.05mm(range:4.85–8.81mm)and 7.02±0.99mm(range:4.87–9.05mm) respectivelyupon the first examination; upon the second examination, theaverage pupil diameters of the right and left eyes were 6.93±0.93mm(4.87–8.89mm)and7.05±0.94mm(4.99–9.13mm) respectively. There wasnot any significant difference between the results of the twoseparate examinations for either eye.Conclusions: A precise measurement of scotopic pupil size isnecessary before refractive corneal and refractive lens surgery.Infrared pupilometer provides us with quantitative informationof pupil under scotopic condition.